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Hermal activity from the Qixia Formation within the central uplift of Sichuan Basin is still unclear. Recently, the excellent exploitation prospective from the Permian natural gas in Sichuan Basin has been shown. By the end of 2017, the accumulative proved reserves of natural gas within the Middle Permian in Sichuan Basin reached 881 108 m3 [9]. The Middle Permian Qixia Formation experienced early diagenesis for the duration of probably the most intensive basalt eruption [10]. The influence with the hydrothermal activities around the dolostone within the early diagenetic stage has not been well known. Depending on the observation of thin sections; scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analysis; C, O, Sr isotopes measurement; cathode luminescence; and fluid inclusion homogenization temperature detection, this study aims to reveal the influence of hydrothermal activities around the formation and evolution with the dolostones within the Qixia Formation within the central uplift of the Sichuan Basin. 2. Geological Setting The study region is positioned in the flank on the giant nose-shaped structure of LeshanLongnusi paleo-uplift (Figure 1b). The tectonic evolution inside the study region was mainly affected by the central uplift on the Sichuan Basin [11,12]. The central uplift developed in the Caledonian period and finally formed within the Early Permian soon after various tectonic movements [136]. For the duration of the Middle Permian period, the uplift of your basin basement resulted in differential denudation in the major of the Middle Permian within the study region [17] (Figure 1c). As a consequence of the Emei ground fissuring movement, a big amount of basalt erupted within the early stage of the Late Permian, with all the basement fault’s reactivation and hydrothermal fluid activity [9,17,18]. There are 4 stages with the Emei mantle plume activities [17]. In the initial stage of the Emei, basalt started to erupt along with the relative sea level fall occurred within the late Qixia period. The second stage was characterized by the extensional rifting in the early restricted platform for the basin facies within the middle and late Maokou period. In the third stage, the pervasive karstification using the important fall of relative sea level, occurred within the end on the Maokou period. Within the fourth stage on the basalt eruption, faults had been activated, and hydrothermal fluid charged into reservoirs inside the early period on the Late Permian [17]. In the study location, the strata in the Sinian towards the Jurassic periods may very well be identified, when the Psalmotoxin 1 Epigenetics Devonian is BVT948 custom synthesis normally absent. The Ordovician to Carboniferous sediments is often found sometimes in the edge in the study area. Because of this, the Permian strata directly overlaid the Cambrian 1 in most region. The Upper Permian strata is composed from the Longtan along with the Changxing formations, and also the Middle Permian could possibly be divided in to the Qixia Formation along with the Maokou Formation. The Reduced Permian consists on the Liangshan Formation [181]. The Qixia Formation includes a conformable speak to relationship with all the Lower Permian Liangshan Formation and also the Maokou Formation [213]. Nevertheless, the parallel unconformity among the Qixia Formation as well as the Maokou Formation may be observed in the northwest Sichuan Basin [24,25]. Throughout the Middle Permian, the Qixia Formation deposited on the shallow open marine setting, which includes shoal and back-shoal [26]. The Qixia Formation features a thicknessMinerals 2021, 11,3 ofof 8010 m and can be divided into two members, e.g., the initial member and the second member in the Qixia For.

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Author: haoyuan2014